"these require deep understanding of the domain, the codebase, and good software engineering principles" Most of this AI can figure out eventually, except maybe the domain. But essentially software engineering will look a lot like product management in a few years.
As a (very good I would say) product manager once told me - the product vision and strategy depends very much on the ability to execute. The market doesn't stand still, and what you _can_ do defines very much what you _should_ do.
What I mean to say here is that not even product management is reduced to just "understand the domain" - so it kinda' feels that your entire prediction leans on overly-simplified assumptions.
pretty big logic leap you made there. I didn't say understanding the domain was the only requirement. But certainly not understanding it will cause you to fail.
